There are two other kinds of research that have thrown some light on the origins of the Native American population; they involve the study of teeth and of languages.
还有另外两种研究对印第安人的起源提供了一些线索；它们包括对牙齿和语言的研究。
Some languages would require more than a year of study for a native English speaker, while others would take just weeks.
有些语言对于英语母语者来说需要花一年多去学习，而有的语言只需花几周。
An increasing number of people take up the study of Japanese every year, bringing with them an increasing diversity of native languages and goals in studying Japanese.
随着学习日语的人数逐年增加，其母语及学习目的也趋于多样化，随之出现了各种形式的日语学习书籍。
An increasing number of people take up the study of Japanese every year, bringing with them an increasing diversity of native languages and goals in studying Japanese.
随着学习日语的人数逐年增加，其母语及学习目的也趋于多样化，随之出现了各种形式的日语学习书籍。
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